TranS1 Inc. (TSON: Quote) is jumping 50 percent to $4.91. The company announced that the American Medical Association' Current Procedural Terminology Panel has voted to approve an application for a Category I CPT code for L5-S1 spinal fusion utilizing its pre-sacral interbody fusion approach with AxiaLIF implant.

Archipelago Learning, Inc. (ARCL: Quote) is up 22 percent to $11.00. The company agreed to be acquired by PLATO Learning, a portfolio company of Thoma Bravo, LLC, for $11.10 per share in cash, representing an equity value of approximately $291 million.

Walgreen Co. (WAG: Quote) is up 0.06 percent to $32.71. The company's comparable store sales declined 4.6 percent in February, with total sales, including stores open less than a year, rising 1.5 percent.

Citigroup Inc. (C: Quote) is down 0.38 percent to $33.97. The company announced on Friday that Richard Parsons, who has been Chairman of the board since 2009 and a board member since 1996, will not seek re-election to board at the upcoming Annual Meeting of Stockholders on April 17, 2012. Michael O'Neill will succeed Parsons as Chairman after the annual meeting.

Advanced Micro Devices, Inc. (AMD: Quote) is down 0.54 percent to $7.42. The company has entered into an amendment to its Wafer Supply Agreement with GLOBALFOUNDRIES Inc. and also agreed to transfer remaining ownership interest in GLOBALFOUNDRIES to that company itself. AMD expects to record a one-time charge in the first quarter.

PEPCO Holdings Inc. (POM: Quote) is down 3 percent to $18.90. The company said it plans to make a registered underwritten public offering of up to 15.4 million shares of its common stock.

Marsh & McLennan Companies, Inc. (MMC: Quote) is down 0.19 percent to $31.64. The company disclosed that Vanessa Wittman, its Executive Vice President & Chief Financial Officer, notified that she was resigning in order to accept a senior role at Google Inc. (GOOG). Effective upon Wittman's departure in late March, Michael Bischoff will assume the role of principal financial officer on an interim basis.

Trading in shares of Ituran Location and Control Ltd. (ITRN: Quote) was halted. The company announced, that the Administrative Court of the State of São Paulo dismissed the State Revenue Services of São Paulo's claim and resolved in its favor.